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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1408 | serge | 1 | #ifndef _LINUX_BITOPS_H |
| 2 | #define _LINUX_BITOPS_H |
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| 3 | |||
| 4 | #define BIT(nr) (1UL << (nr)) |
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| 5 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
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| 6 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
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| 7 | #define BITS_PER_BYTE 8 |
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| 8 | #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
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| 9 | |||
| 10 | /* |
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| 11 | * Include this here because some architectures need generic_ffs/fls in |
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| 12 | * scope |
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| 13 | */ |
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| 14 | #include |
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| 15 | |||
| 16 | #define for_each_bit(bit, addr, size) \ |
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| 17 | for ((bit) = find_first_bit((addr), (size)); \ |
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| 18 | (bit) < (size); \ |
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| 19 | (bit) = find_next_bit((addr), (size), (bit) + 1)) |
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| 20 | |||
| 21 | |||
| 22 | static __inline__ int get_bitmask_order(unsigned int count) |
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| 23 | { |
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| 24 | int order; |
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| 25 | |||
| 26 | order = fls(count); |
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| 27 | return order; /* We could be slightly more clever with -1 here... */ |
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| 28 | } |
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| 29 | |||
| 30 | static __inline__ int get_count_order(unsigned int count) |
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| 31 | { |
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| 32 | int order; |
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| 33 | |||
| 34 | order = fls(count) - 1; |
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| 35 | if (count & (count - 1)) |
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| 36 | order++; |
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| 37 | return order; |
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| 38 | } |
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| 39 | |||
| 40 | static inline unsigned long hweight_long(unsigned long w) |
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| 41 | { |
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| 42 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
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| 43 | } |
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| 44 | |||
| 45 | /** |
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| 46 | * rol32 - rotate a 32-bit value left |
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| 47 | * @word: value to rotate |
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| 48 | * @shift: bits to roll |
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| 49 | */ |
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| 50 | static inline __u32 rol32(__u32 word, unsigned int shift) |
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| 51 | { |
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| 52 | return (word << shift) | (word >> (32 - shift)); |
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| 53 | } |
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| 54 | |||
| 55 | /** |
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| 56 | * ror32 - rotate a 32-bit value right |
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| 57 | * @word: value to rotate |
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| 58 | * @shift: bits to roll |
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| 59 | */ |
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| 60 | static inline __u32 ror32(__u32 word, unsigned int shift) |
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| 61 | { |
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| 62 | return (word >> shift) | (word << (32 - shift)); |
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| 63 | } |
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| 64 | |||
| 65 | /** |
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| 66 | * rol16 - rotate a 16-bit value left |
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| 67 | * @word: value to rotate |
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| 68 | * @shift: bits to roll |
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| 69 | */ |
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| 70 | static inline __u16 rol16(__u16 word, unsigned int shift) |
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| 71 | { |
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| 72 | return (word << shift) | (word >> (16 - shift)); |
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| 73 | } |
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| 74 | |||
| 75 | /** |
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| 76 | * ror16 - rotate a 16-bit value right |
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| 77 | * @word: value to rotate |
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| 78 | * @shift: bits to roll |
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| 79 | */ |
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| 80 | static inline __u16 ror16(__u16 word, unsigned int shift) |
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| 81 | { |
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| 82 | return (word >> shift) | (word << (16 - shift)); |
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| 83 | } |
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| 84 | |||
| 85 | /** |
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| 86 | * rol8 - rotate an 8-bit value left |
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| 87 | * @word: value to rotate |
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| 88 | * @shift: bits to roll |
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| 89 | */ |
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| 90 | static inline __u8 rol8(__u8 word, unsigned int shift) |
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| 91 | { |
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| 92 | return (word << shift) | (word >> (8 - shift)); |
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| 93 | } |
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| 94 | |||
| 95 | /** |
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| 96 | * ror8 - rotate an 8-bit value right |
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| 97 | * @word: value to rotate |
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| 98 | * @shift: bits to roll |
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| 99 | */ |
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| 100 | static inline __u8 ror8(__u8 word, unsigned int shift) |
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| 101 | { |
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| 102 | return (word >> shift) | (word << (8 - shift)); |
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| 103 | } |
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| 104 | |||
| 105 | static inline unsigned fls_long(unsigned long l) |
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| 106 | { |
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| 107 | if (sizeof(l) == 4) |
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| 108 | return fls(l); |
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| 109 | return fls64(l); |
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| 110 | } |
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| 111 | |||
| 112 | /** |
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| 113 | * __ffs64 - find first set bit in a 64 bit word |
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| 114 | * @word: The 64 bit word |
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| 115 | * |
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| 116 | * On 64 bit arches this is a synomyn for __ffs |
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| 117 | * The result is not defined if no bits are set, so check that @word |
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| 118 | * is non-zero before calling this. |
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| 119 | */ |
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| 120 | static inline unsigned long __ffs64(u64 word) |
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| 121 | { |
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| 122 | #if BITS_PER_LONG == 32 |
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| 123 | if (((u32)word) == 0UL) |
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| 124 | return __ffs((u32)(word >> 32)) + 32; |
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| 125 | #elif BITS_PER_LONG != 64 |
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| 126 | #error BITS_PER_LONG not 32 or 64 |
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| 127 | #endif |
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| 128 | return __ffs((unsigned long)word); |
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| 129 | } |
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| 130 | |||
| 131 | #ifdef __KERNEL__ |
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| 132 | #ifdef CONFIG_GENERIC_FIND_FIRST_BIT |
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| 133 | |||
| 134 | /** |
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| 135 | * find_first_bit - find the first set bit in a memory region |
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| 136 | * @addr: The address to start the search at |
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| 137 | * @size: The maximum size to search |
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| 138 | * |
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| 139 | * Returns the bit number of the first set bit. |
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| 140 | */ |
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| 141 | extern unsigned long find_first_bit(const unsigned long *addr, |
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| 142 | unsigned long size); |
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| 143 | |||
| 144 | /** |
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| 145 | * find_first_zero_bit - find the first cleared bit in a memory region |
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| 146 | * @addr: The address to start the search at |
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| 147 | * @size: The maximum size to search |
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| 148 | * |
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| 149 | * Returns the bit number of the first cleared bit. |
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| 150 | */ |
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| 151 | extern unsigned long find_first_zero_bit(const unsigned long *addr, |
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| 152 | unsigned long size); |
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| 153 | #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
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| 154 | |||
| 155 | #ifdef CONFIG_GENERIC_FIND_LAST_BIT |
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| 156 | /** |
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| 157 | * find_last_bit - find the last set bit in a memory region |
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| 158 | * @addr: The address to start the search at |
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| 159 | * @size: The maximum size to search |
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| 160 | * |
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| 161 | * Returns the bit number of the first set bit, or size. |
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| 162 | */ |
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| 163 | extern unsigned long find_last_bit(const unsigned long *addr, |
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| 164 | unsigned long size); |
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| 165 | #endif /* CONFIG_GENERIC_FIND_LAST_BIT */ |
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| 166 | |||
| 167 | #ifdef CONFIG_GENERIC_FIND_NEXT_BIT |
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| 168 | |||
| 169 | /** |
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| 170 | * find_next_bit - find the next set bit in a memory region |
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| 171 | * @addr: The address to base the search on |
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| 172 | * @offset: The bitnumber to start searching at |
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| 173 | * @size: The bitmap size in bits |
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| 174 | */ |
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| 175 | extern unsigned long find_next_bit(const unsigned long *addr, |
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| 176 | unsigned long size, unsigned long offset); |
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| 177 | |||
| 178 | /** |
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| 179 | * find_next_zero_bit - find the next cleared bit in a memory region |
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| 180 | * @addr: The address to base the search on |
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| 181 | * @offset: The bitnumber to start searching at |
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| 182 | * @size: The bitmap size in bits |
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| 183 | */ |
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| 184 | |||
| 185 | extern unsigned long find_next_zero_bit(const unsigned long *addr, |
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| 186 | unsigned long size, |
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| 187 | unsigned long offset); |
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| 188 | |||
| 189 | #endif /* CONFIG_GENERIC_FIND_NEXT_BIT */ |
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| 190 | #endif /* __KERNEL__ */ |
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| 191 | #endif |